ENTRY M0346 20090323 M047M034600000001 SUBENT M0346001 20090323 M047M034600100001 BIB 20 50 M034600100002 TITLE Photoneutron disintigration of Ar-40. M034600100003 AUTHOR (J.W.JURY,J.I.LODGE,K.H.LOKAN,N.K.SHERMAN,R.W.GELLIE) M034600100004 INSTITUTE (1CANOTC) M034600100005 REFERENCE (J,CJP,51,1176,1973) M034600100006 FACILITY (LINAC,1CANOTC) M034600100007 INC-SOURCE (BRST) M034600100008 SAMPLE Enriched to 99.6 p.c. Ar-40 contained in the 12 cm di- M034600100009 ameter vacuum-insulated target-vessel. M034600100010 METHOD (TOF,REC) M034600100011 PART-DET (P) M034600100012 DETECTOR (SCIN). Proton-recoil detector was consisted of 8 cm M034600100013 thick cylinder of Ne 102 scintillator viewed by 4 pho- M034600100014 tomultiplied tubes. M034600100015 MONITOR (1-H-2(G,N)1-H-1,,SIG) M034600100016 MONIT-REF (,A.WHETSTONE+,J,PR,109,2072,1958) M034600100017 ANALYSIS A series of photoneutron difference spectra were obta- M034600100018 ined by subtracting the neutron spectrum measured at M034600100019 each end-point energy from the spectrum obtained at M034600100020 the next higher energy. such subtractions were carried M034600100021 out for 1 MeV differences up to 16 mev and in 2 MeV M034600100022 steps thereafter. M034600100023 ERR-ANALYS The energy resolution of time-of-flight method at M034600100024 neutron energy of 1 MeV. M034600100025 CORRECTION Data were corrected for (a) the background and (b) the M034600100026 detector efficiency. M034600100027 ADD-RES (COMP). The theoretical description of the gamma-quan- M034600100028 tum absorption by the whole nucleus at the resonance M034600100029 energy was performed. M034600100030 REL-REF (N,,R.W.GELLIE+,J,CJP,50,1689,1972).Description of the M034600100031 experimental facility. M034600100032 (A,,D.MCPHERSON+,J,CJP,32,593,1954).The first results M034600100033 on the total photoneutron cross section of Ar-40 were M034600100034 recieved for giant dipole resonance at 20 MeV. M034600100035 (N,,G.G.BUNATYAN+,J,SNP,13,695,1971).The theoretical M034600100036 description of the gamma-quantum absorption. M034600100037 COMMENT Photoneutron energy spectra from Ar-40 have been mea- M034600100038 sured at bremsstrahlung end-point energies from 13 to M034600100039 23 MeV in 1 MeV steps. The total cross section derived M034600100040 from the neutron spectra exhibits a change from single M034600100041 particle behavior at about 14 MeV where collective ef- M034600100042 fects begin to dominate and neutrons are emitted to M034600100043 highly excited states of Ar-39. M034600100044 STATUS (CURVE). M034600100045 HISTORY (19880323C).Data were compiled in SCJAD of Saratov M034600100046 State University. M034600100047 (20081110A) Corrected by V.Varlamov: dates corrected, M034600100048 ERR-ANALYS in SUBENT 001, ANALYSIS and ERR-ANALYS M034600100049 in SUBENT 003 and DATA-ERR in SUBENT 009, SUBENTS M034600100050 004 - 008 deleted because quantity at two incident M034600100051 energies cannot be compiled, lowercase. M034600100052 ENDBIB 50 0 M034600100053 COMMON 1 3 M034600100054 E-RSL M034600100055 MEV M034600100056 0.02 M034600100057 ENDCOMMON 3 0 M034600100058 ENDSUBENT 57 0 M034600199999 SUBENT M0346002 20090323 M047M034600200001 BIB 8 21 M034600200002 REACTION (18-AR-40(G,N)18-AR-39,PAR,DA,,BRA) M034600200003 EN-SEC (E-LVL,18-AR-39) The excitation energy after neutron M034600200004 emission. M034600200005 COMMENT All neutron transitions below an excitation energy of M034600200006 13 MeV proceeded directly to the ground state of Ar-39 M034600200007 By compiler : data were read from solid curve with co- M034600200008 nstant step by compiler. The solid curve was obtained M034600200009 by authors. M034600200010 ANALYSIS The efficiency-corrected neutron spectra from Ar-40 M034600200011 were divided by the bremsstrahlung intensity distribu- M034600200012 tions. M034600200013 ERR-ANALYS No information. M034600200014 MISC-COL (MISC) The resonance energy of Ar-40. M034600200015 ADD-RES (COMP). The theoretical interpretation of resonance as M034600200016 photon doorway states for formalism of compound nuclei M034600200017 was made. M034600200018 REL-REF (N,,K.H.LOKAN+,J,PRL,28,1526,1972).The interpretation M034600200019 of the structure at about 11 MeV in the photoneutron M034600200020 cross section of Ar-40. M034600200021 (N,,S.C.FULTZ+,J,PR/C,4,149,1971). The theoretical M034600200022 interpretation of resonances. M034600200023 ENDBIB 21 0 M034600200024 COMMON 3 3 M034600200025 E-LVL ANG EN-MAX M034600200026 MEV ADEG MEV M034600200027 0.0 90. 23. M034600200028 ENDCOMMON 3 0 M034600200029 DATA 3 158 M034600200030 E DATA MISC M034600200031 MEV MB/SR MEV M034600200032 0.470 0.31 M034600200033 0.480 0.94 M034600200034 0.490 1.74 M034600200035 0.500 2.08 10.393 M034600200036 0.510 1.88 M034600200037 0.520 1.32 M034600200038 0.530 3.57 10.418 M034600200039 0.540 1.63 M034600200040 0.550 0.64 M034600200041 0.560 1.56 10.451 M034600200042 0.570 1.53 M034600200043 0.580 1.18 M034600200044 0.590 1.36 10.481 M034600200045 0.600 0.14 M034600200046 0.610 0.16 M034600200047 0.620 0.90 10.522 M034600200048 0.630 0.83 M034600200049 0.640 0.39 M034600200050 0.650 0.70 M034600200051 0.660 1.49 M034600200052 0.670 1.70 10.573 M034600200053 0.680 1.12 M034600200054 0.690 2.58 10.593 M034600200055 0.700 1.84 M034600200056 0.710 0.94 M034600200057 0.720 0.87 M034600200058 0.730 0.93 M034600200059 0.740 1.99 M034600200060 0.750 2.23 10.648 M034600200061 0.760 1.91 M034600200062 0.770 0.68 M034600200063 0.780 1.25 M034600200064 0.790 1.62 10.680 M034600200065 0.800 1.60 M034600200066 0.810 0.94 M034600200067 0.820 0.12 M034600200068 0.830 0.56 M034600200069 0.840 1.04 10.725 M034600200070 0.850 0.82 M034600200071 0.860 0.52 M034600200072 0.870 3.29 10.762 M034600200073 0.880 2.71 M034600200074 0.890 2.14 M034600200075 0.900 0.73 M034600200076 0.910 0.97 M034600200077 0.920 2.68 10.813 M034600200078 0.930 2.57 M034600200079 0.940 0.56 M034600200080 0.950 0.17 M034600200081 0.960 0.38 M034600200082 0.970 0.42 M034600200083 0.980 0.45 M034600200084 0.990 0.42 M034600200085 1.000 0.73 M034600200086 1.015 1.74 M034600200087 1.030 2.61 10.920 M034600200088 1.044 1.89 M034600200089 1.074 0.87 M034600200090 1.089 0.45 M034600200091 1.104 0.52 M034600200092 1.118 0.56 M034600200093 1.133 0.59 M034600200094 1.148 0.66 M034600200095 1.163 1.22 M034600200096 1.178 2.02 11.050 M034600200097 1.193 0.87 M034600200098 1.207 1.53 M034600200099 1.220 3.30 11.090 M034600200100 1.237 2.78 M034600200101 1.252 0.97 M034600200102 1.267 0.90 M034600200103 1.282 0.94 M034600200104 1.296 1.15 M034600200105 1.311 1.32 M034600200106 1.326 1.46 M034600200107 1.341 1.55 11.200 M034600200108 1.356 0.66 M034600200109 1.370 1.08 M034600200110 1.385 2.17 11.260 M034600200111 1.400 1.18 M034600200112 1.415 0.80 M034600200113 1.430 0.80 M034600200114 1.444 1.01 M034600200115 1.459 1.70 M034600200116 1.474 1.91 11.340 M034600200117 1.489 1.25 M034600200118 1.504 0.73 M034600200119 1.519 1.15 M034600200120 1.533 1.60 M034600200121 1.548 1.74 11.430 M034600200122 1.563 1.32 M034600200123 1.578 0.83 M034600200124 1.593 0.73 M034600200125 1.607 1.08 M034600200126 1.622 2.26 11.510 M034600200127 1.637 2.19 M034600200128 1.652 1.88 M034600200129 1.668 1.29 M034600200130 1.682 0.73 M034600200131 1.696 0.66 M034600200132 1.711 0.63 M034600200133 1.726 0.64 M034600200134 1.741 0.66 M034600200135 1.756 0.83 M034600200136 1.770 1.08 11.670 M034600200137 1.785 0.80 M034600200138 1.800 0.63 M034600200139 1.815 0.99 11.710 M034600200140 1.830 0.63 M034600200141 1.844 0.78 M034600200142 1.859 0.87 M034600200143 1.874 0.90 M034600200144 1.889 1.04 M034600200145 1.904 1.18 11.810 M034600200146 1.919 1.01 M034600200147 1.933 0.80 M034600200148 1.948 0.66 M034600200149 1.963 0.73 M034600200150 1.978 1.29 M034600200151 1.993 1.50 11.900 M034600200152 2.007 0.94 M034600200153 2.022 0.49 M034600200154 2.037 0.45 M034600200155 2.052 0.38 M034600200156 2.067 0.42 M034600200157 2.082 0.49 M034600200158 2.096 0.56 M034600200159 2.111 0.80 M034600200160 2.126 0.97 M034600200161 2.141 1.04 12.060 M034600200162 2.156 0.94 M034600200163 2.170 0.76 M034600200164 2.185 0.59 M034600200165 2.200 0.52 M034600200166 2.215 0.52 M034600200167 2.230 0.59 M034600200168 2.244 0.56 M034600200169 2.259 0.48 M034600200170 2.274 0.31 M034600200171 2.289 0.24 M034600200172 2.304 0.14 M034600200173 2.319 0.24 M034600200174 2.333 0.31 M034600200175 2.348 0.49 M034600200176 2.363 0.63 M034600200177 2.378 0.66 M034600200178 2.393 0.56 M034600200179 2.407 0.17 M034600200180 2.422 0.14 M034600200181 2.437 0.17 M034600200182 2.452 0.14 M034600200183 2.467 0.31 M034600200184 2.482 0.38 M034600200185 2.496 0.42 12.410 M034600200186 2.511 0.13 M034600200187 2.526 0.24 M034600200188 2.541 0.14 M034600200189 2.556 0.03 M034600200190 ENDDATA 160 0 M034600200191 ENDSUBENT 190 0 M034600299999 SUBENT M0346003 20090323 M047M034600300001 BIB 4 9 M034600300002 REACTION (18-AR-40(G,N)18-AR-39,PAR,DA) M034600300003 EN-SEC (E-LVL,18-AR-39) The excitation energy after neutron M034600300004 emission. M034600300005 ANALYSIS The cross section was averaged over 200 keV energy in- M034600300006 tervals to illustrate the gross behavior of the photon M034600300007 absorption in this region. M034600300008 ERR-ANALYS No information. M034600300009 EN-ERR is half of the energy region in which the cross M034600300010 section was averaged. M034600300011 ENDBIB 9 0 M034600300012 COMMON 3 3 M034600300013 E-LVL EN-RSL ANG M034600300014 MEV MEV ADEG M034600300015 0.0 0.1 90. M034600300016 ENDCOMMON 3 0 M034600300017 DATA 2 12 M034600300018 EN DATA M034600300019 MEV MB/SR M034600300020 10.37 1.456 M034600300021 10.56 1.193 M034600300022 10.74 1.351 M034600300023 10.92 1.123 M034600300024 11.10 0.807 M034600300025 11.27 0.702 M034600300026 11.44 0.772 M034600300027 11.63 0.491 M034600300028 11.82 0.526 M034600300029 12.02 0.404 M034600300030 12.20 0.333 M034600300031 12.40 0.263 M034600300032 ENDDATA 14 0 M034600300033 ENDSUBENT 32 0 M034600399999 NOSUBENT M0346004 20090323 M047M034600400001 NOSUBENT M0346005 20090323 M047M034600500001 NOSUBENT M0346006 20090323 M047M034600600001 NOSUBENT M0346007 20090323 M047M034600700001 NOSUBENT M0346008 20090323 M047M034600800001 SUBENT M0346009 20090323 M047M034600900001 BIB 5 13 M034600900002 REACTION (18-AR-40(G,N)18-AR-39,PAR,DA,,BRS) M034600900003 EN-SEC (E-LVL,18-AR-39) The excitation energy after neutron M034600900004 emission. M034600900005 ANALYSIS The ground state differential cross section has been M034600900006 recieved from the neutron difference spectra dividing M034600900007 by the bremsstrahlung intensity distributions. the fi- M034600900008 ne structure in the low energy region has been averag- M034600900009 ed over 200 keV intervals. M034600900010 data are a collage of results obtained by using 11 di- M034600900011 fferent end-points energies. M034600900012 ERR-ANALYS (ERR-S) Statistical errors of measurements. M034600900013 MISC-COL (MISC) The relative number of non-ground state transi- M034600900014 tions from excited states of Ar-40. M034600900015 ENDBIB 13 0 M034600900016 COMMON 3 3 M034600900017 E-LVL ERR-S ANG M034600900018 MEV MB/SR ADEG M034600900019 0. 0.03 90. M034600900020 ENDCOMMON 3 0 M034600900021 DATA 3 105 M034600900022 EN DATA MISC M034600900023 MEV MB/SR PER-CENT M034600900024 11.16 0.92 M034600900025 11.26 0.78 M034600900026 11.35 0.87 M034600900027 11.48 0.85 M034600900028 11.53 0.68 M034600900029 11.66 0.52 M034600900030 11.84 0.54 M034600900031 11.93 0.32 M034600900032 12.02 0.44 M034600900033 12.11 0.32 M034600900034 12.25 0.22 M034600900035 12.29 0.17 M034600900036 12.38 0.12 M034600900037 12.56 0.11 M034600900038 12.63 0.18 M034600900039 12.79 0.12 M034600900040 12.97 0.13 M034600900041 13.06 0.14 M034600900042 13.24 0.16 M034600900043 13.37 0.12 M034600900044 13.51 0.16 0.69 M034600900045 13.60 0.18 M034600900046 13.69 0.22 M034600900047 13.78 0.25 M034600900048 13.87 0.24 M034600900049 14.00 0.25 M034600900050 14.14 0.27 M034600900051 14.23 0.30 M034600900052 14.32 0.32 M034600900053 14.41 0.28 54.86 M034600900054 14.50 0.19 M034600900055 14.59 0.23 M034600900056 14.68 0.25 M034600900057 14.77 0.29 M034600900058 14.86 0.29 M034600900059 14.95 0.32 M034600900060 15.08 0.33 M034600900061 15.13 0.34 M034600900062 15.22 0.36 M034600900063 15.31 0.38 M034600900064 15.40 0.53 M034600900065 15.44 0.46 67.36 M034600900066 15.50 0.28 M034600900067 15.67 0.26 M034600900068 15.76 0.29 M034600900069 15.85 0.36 M034600900070 15.94 0.32 M034600900071 16.03 0.28 M034600900072 16.12 0.32 M034600900073 16.21 0.31 M034600900074 16.30 0.29 M034600900075 16.39 0.28 M034600900076 16.48 0.20 M034600900077 16.57 0.23 M034600900078 16.66 0.18 M034600900079 16.75 0.22 M034600900080 16.84 0.24 M034600900081 17.02 0.28 71.53 M034600900082 17.15 0.34 M034600900083 17.29 0.35 M034600900084 17.38 0.33 M034600900085 17.47 0.33 M034600900086 17.60 0.29 M034600900087 17.74 0.37 M034600900088 17.83 0.36 M034600900089 17.92 0.31 M034600900090 18.01 0.25 M034600900091 18.10 0.32 M034600900092 18.19 0.30 M034600900093 18.28 0.21 M034600900094 18.37 0.15 M034600900095 18.46 0.23 M034600900096 18.60 0.20 M034600900097 18.68 0.23 M034600900098 18.82 0.26 M034600900099 18.95 0.22 M034600900100 19.00 0.23 88.89 M034600900101 19.05 0.36 M034600900102 19.09 0.24 M034600900103 19.18 0.32 M034600900104 19.27 0.22 M034600900105 19.36 0.32 M034600900106 19.49 0.25 M034600900107 19.67 0.23 M034600900108 19.90 0.24 M034600900109 20.08 0.27 M034600900110 20.17 0.26 M034600900111 20.26 0.24 M034600900112 20.44 0.21 M034600900113 20.53 0.20 M034600900114 20.66 0.13 M034600900115 20.84 0.17 M034600900116 21.16 0.13 95.14 M034600900117 21.47 0.12 M034600900118 21.74 0.12 M034600900119 21.88 0.12 M034600900120 21.97 0.10 M034600900121 22.06 0.13 M034600900122 22.15 0.14 M034600900123 22.24 0.11 M034600900124 22.33 0.12 M034600900125 22.51 0.14 M034600900126 22.60 0.09 M034600900127 22.73 0.06 M034600900128 22.87 0.07 M034600900129 ENDDATA 107 0 M034600900130 ENDSUBENT 129 0 M034600999999 SUBENT M0346010 20090323 M047M034601000001 BIB 6 12 M034601000002 REACTION (18-AR-40(G,X)0-NN-1,,SIG) M034601000003 ASSUMED Isotropy of the neutron angular distributions is assu- M034601000004 med as an approximation. M034601000005 ANALYSIS The total cross section has been obtained as a product M034601000006 of the ground-state differential cross section by the M034601000007 sum of the unit and the relative number of non-ground M034601000008 state transitions from excited states of Ar-40. M034601000009 ERR-ANALYS No information. M034601000010 ADD-RES The integrated strength of the measured total photone- M034601000011 utron cross section was found to be 260 mb*MeV with 60 M034601000012 mb*MeV error. M034601000013 STATUS (DEP,M0346009) M034601000014 ENDBIB 12 0 M034601000015 NOCOMMON 0 0 M034601000016 DATA 2 9 M034601000017 EN DATA M034601000018 MEV MB M034601000019 11.03 10.78 M034601000020 12.00 5.88 M034601000021 13.03 2.35 M034601000022 14.45 8.63 M034601000023 15.03 10.98 M034601000024 16.00 16.47 M034601000025 16.90 22.16 M034601000026 18.97 33.14 M034601000027 20.97 31.96 M034601000028 ENDDATA 11 0 M034601000029 ENDSUBENT 28 0 M034601099999 ENDENTRY 10 0 M034699999999